program cifra_infoarena;
var j,i,n,s,p:longint;
f,g:text;
begin
assign(f,'cifra.in');
reset(f);
assign(g,'cifra.out');
rewrite(g);
readln(f,n);
s:=0;
for i:=1 to n do begin
readln(f,i);
p:=1;
for j:=1 to i do
p:=(p*i)mod 10;
s:=(s+p)mod 10;
writeln(g,s);
end;
close(f);
close(g);
end.